Based on MySQL 5.7.22, including all the bug fixes in it, Percona Server for MySQL 5.7.22-22 is the current GA release in the Percona Server for MySQL 5.7 series. Percona provides completely open-source and free software.

New Features:

A new --encrypt-tmp-files option turns on encryption for the temporary files which Percona Server may create on disk for filesort, binary log transactional caches and Group Replication caches.

Bugs Fixed:

Executing the SHOWGLOBALSTATUS expression could cause “data drift” on global status variables in case of a query rollback: the variable, being by its nature a counter and allowing only an increase, could return to its previous value. Bug fixed #3951 (upstream #90351).

NUMA support was improved in Percona Server, reverting upstream implementation back to the original one,due to upstream variant being less effective in memory allocation. Now innodb_numa_interleave variable not only enables NUMA interleave memory policy for the InnoDB buffer pool allocation, but forces NUMA interleaved allocation at the buffer pool initialization time. Bug fixed #3967.

audit_log_include_accounts variable did not take effect if placed in my.cnf configuration file, while still working as intended if set dynamically. Bug fixed #3867.

A key_block_size value was set automatically by the Improved MEMORY Storage Engine, which resulted in warnings when changing the engine type to InnoDB, and constantly growing key_block_size during alter operations. Bugs fixed #3936, #3940, and #3943.